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KEEYASK TRANSMISSION PROJECT EA REPORT
CHAPTER 2 – PROJECT DESCRIPTION
2-1
2.0 PROJECT DESCRIPTION
2.1 INTRODUCTION
2.1.1 Overview of Manitoba Hydro’s Transmission System
Manitoba is heavily reliant on hydroelectricity, approximately 70% of which is generated in
plants along the Nelson River in the form of alternating current (ac). A small portion of this
generation is fed directly to the northern ac transmission system to serve northern areas. The
remainder is connected to the Northern ac Collector Transmission System (Map 2-1). This
collector system connects the generating stations on the Nelson River to the dc converter
stations at Radisson and Henday. Two HVdc lines (Bipole I and II) connect the Radisson and
Henday Converter Stations in northern Manitoba to the Dorsey Converter Station, located near
Winnipeg. From there, the electricity is distributed throughout much of southern Manitoba
through the southern ac transmission system (Map 2-1).
The remaining hydraulic generation is supplied by generating stations on the Winnipeg River, at
Grand Rapids on the Saskatchewan River and at Jenpeg on the Upper Nelson River, north of
Lake Winnipeg. Generation outlet transmission facilities for the Winnipeg River plants consist of
115 kV ac transmission lines that connect to the southern account transmission system and are
not converted to dc due to short distances to stations (Map 2-1).
When operating at full capacity, Manitoba Hydro’s hydraulic generation system produces more
power than required for today’s domestic consumption. High-voltage ac transmission facilities
interconnected to Saskatchewan, Ontario and the US make it possible to export power to those
jurisdictions. Interconnected transmission facilities also allow Manitoba Hydro to import power
during periods of drought and periods during which demand in Manitoba exceeds the supply
Manitoba Hydro can generate, thereby strengthening the reliability of the provincial electric
system.
2.2 PROJECT COMPONENT OVERVIEW
The Keeyask Transmission Project will consist of the following:
Construction Power Transmission Line and Construction Power Station.
Four Unit Transmission Lines that originate at the Keeyask Generating Station and
terminate at a new Keeyask Switching Station.
Keeyask Switching Station.
KEEYASK TRANSMISSION PROJECT EA REPORT
CHAPTER 2 – PROJECT DESCRIPTION
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Three Generation Outlet Transmission (GOT) Lines link the Keeyask Switching Station to
the northern collector system, terminating at the Radisson Converter Station.
Radisson Converter Station Upgrades
2.2.1 Construction Power Transmission Line and Station
The Project will include a new Construction Power Transmission Line (138 kV and
approximately 22 km long) from the existing 138 kV KN36 transmission line to a new 138 kV to
12.47 kV station to be located north of the proposed Keeyask Generation Station. The purpose
of the Construction Power Transmission Line and Construction Power Station is to provide
power to construct the Keeyask Generation Project. After the Keeyask Generating Station is
constructed, the Construction Power Transmission Line will be left in place, as will a portion of
the Construction Power Station, to provide a contingency function for a “black start” emergency
backup to diesel generation units at the Generating Station.
2.2.2 Unit Transmission Lines
Four 138 kV ac ttransmission lines (KE1 to 4), called the Unit Transmission Lines, will transmit
power from the seven generators located at the Keeyask Generating Station to the new
Keeyask Switching Station. Three lines will be double circuit and one line single circuit to accept
power from the seven Generating Station turbines. The four lines, each approximately 4 km
long, will be located in a single corridor.
2.2.3 Keeyask Switching Station
A new Keeyask Switching Station will accept power from the Generating Station via the four
Unit Transmission Lines and transfer that power to three Generation Outlet Transmission lines.
The switching station will be located on the south side of the Nelson River. The purpose of the
switching station is to provide the terminal facilities for the electrical connection to the Keeyask
Generating Station, and to provide flexibility in switching load between incoming Unit
Transmission Lines from the Generating Station to the Generation Outlet Transmission Lines
going to Radisson Converter Station.
2.2.4 Generation Outlet Transmission Lines
Three 138 kV ac Transmission Lines will transmit power from the Keeyask Switching Station to
the existing Radisson Converter Station 138 kV ac switchyard. Known as the Generation Outlet
Transmission (GOT) Lines, the three lines, each approximately 38 km long, will be located along
a single route. Manitoba Hydro plans to build one of these GOT lines called KR1 to serve as a
backup construction power line during construction. After Project construction, the KR1
KEEYASK TRANSMISSION PROJECT EA REPORT
CHAPTER 2 – PROJECT DESCRIPTION
2-3
Transmission Line will be partially salvaged and re-terminated at the Keeyask Switching Station
and utilized as a Generation Outlet Transmission Line.
2.2.5 Radisson Converter Station Upgrades
The existing Radisson Converter Station will be upgraded in two stages, as follows:
Stage I: The addition of a 138 kV breaker to accommodate the initial new Generation Outlet
Transmission line (KR1) from the Keeyask Switching Station.
Stage II: The addition of equipment including a 138 kV bay (Bay 1) complete with four 138 kV
breakers and associated equipment for the termination of two additional GOT lines (KR2 and
KR3) from the Keeyask Switching Station. KR2 and KR3 will enter the west side of the Radisson
Converter Station and proceed underground around the station and finally terminate to Bay 1.
2.2.6 Preferred Routes and Station Sites
The Preferred Routes and Station Sites are shown on Map 2-2 for the construction and
operation phases, respectively.
2.3 TRANSMISSION LINES – TECHNICAL
DESCRIPTION
The following sections provide a more detailed life cycle description of the transmission line
components included in the Keeyask Transmission Project. The description includes the
construction, operation and maintenance phases of each component, as well as prospective
decommissioning.
The current Project description information is based on preliminary design and on Manitoba
Hydro standards with respect to design and construction, operation and maintenance, and
decommissioning. Project development will also adhere to applicable North American Electric
Reliability Corporation/Midwest Reliability Organization/Midwest Independent System Operator
criteria and Canadian Standard Association (CSA) standards. Subject to approval requirements,
details of the final design may vary from the preliminary design on the basis of field conditions,
contract requirements and contractor implementation.
2.3.1 Unit Transmission Lines
Four 138 kV ac Unit Transmission lines will transmit power from the seven generators located at
the Keeyask Generating Station to the new Keeyask Switching Station. The four lines, each
approximately 4 km long, will be located in a single 265-m-wide corridor. Figure 2-1 illustrates a
typical cross-section for the Unit Transmission Lines.
Figure 2-1: Typical 138 kV Unit Transmission Lines Right-of-Way
Refer to Section A-A on Map 2-3
KEEYASK TRANSMISSION PROJECT EA REPORT
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2.3.1.1 Structure Design and Location
Based on prior design experience in northern Manitoba, guyed lattice steel structures have been
identified as the preliminary design standard for straight (tangent) sections of the transmission
lines. Guyed structures provide flexibility for tower construction and maintenance in difficult
foundation and terrain conditions. Self-supporting lattice steel structures will be used for all
angle or dead-end tower locations.
The conceptual design for a typical guyed lattice suspension structure is illustrated in Figure 2-
2. The structure is based on a single point foundation, stabilized by four guy wires placed
diagonally to the route of the line. The tangent structures will be approximately 38 m in height.
Taller structures with larger footprints will be used where warranted by land use or conditions.
Conceptual design for a typical lattice angle anchor structure is illustrated in Figure 2-3. The
structure has four legs requiring individual foundations and a footprint approximately 15 m
square. The typical structure height is approximately 30 m. The average span between
structures will be approximately 420 m, resulting in approximately 2.4 structures per kilometre.
Additional detail respecting span length and tower placement is provided in Section 2.3.4.2.
2.3.1.2 Conductors and Insulators
The structures for the Unit Transmission Lines will carry a three-phase 138 kV ac circuit
consisting of three Aluminium Conductor Steel Reinforced phase conductors. The specified
phase conductor is a single aluminum conductor steel reinforced conductor, 37.2 mm in
diameter.
The conductors will be insulated from the structures by insulator strings consisting of ceramic
insulator bells attached to the crossarms of the structures using insulator string assemblies.
Conductor clearances are discussed in Section 2.3.4.3.
2.3.1.3 Overhead Ground Wires
Two galvanized steel strand ground conductors having an overall diameter of 9 mm
(approximately 0.34 in.) will be strung between the two peaks of the structures to provide
lightning protection.
2.3.1.4 Switchyard Terminations
Unit Transmission Lines will be terminated into the 138 kV Intermediate Bus Structure at the
Keeyask Switching Station.
Figure 2-2: Typical Guyed Lattice Suspension Structure
Figure 2-3: Typical Lattice Angle Anchor Structure
KEEYASK TRANSMISSION PROJECT EA REPORT
CHAPTER 2 – PROJECT DESCRIPTION
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2.3.2 Generation Outlet Transmission Lines
Three Generation Outlet Transmission Lines (GOT KR1 to 3) will transmit power from the
138 kV ac switchyard at the Keeyask Switching Station to the 138 kV ac Switchyard at the
existing Radisson Converter Station. The three lines will typically be located in a single 200-m-
wide corridor about 38 km long (Figure 2-4); however, the width and configuration of the three
lines in the corridor will vary, as described in Section 2.3.4.1.
Manitoba Hydro is proposing to prebuild one (KR1) of the three GOT lines from the Radisson
Converter Station to the Keeyask Construction Power Station, as a source of backup
construction power during the construction of the Keeyask Generation Station Project. Once
construction of the generating station is complete, a portion of KR1 from the Construction Power
Station back to the Keeyask Switching Station will be salvaged, and KR1 will be terminated into
this Switching Station. The additional GOT lines (KR2 and KR3) will be built from the existing
Radisson Converter Station 138 ac switchyard to the new Keeyask Switching Station.
2.3.2.1 Structure Design and Location
Based on prior design experience in northern Manitoba, guyed lattice steel structures have been
identified as the preliminary design standard for straight (tangent) sections of the transmission
lines. Guyed structures provide flexibility for tower construction and maintenance in difficult
foundation and terrain conditions. Self-supporting lattice steel structures will be used for all
angle or dead-end tower locations.
The conceptual design for a typical guyed lattice suspension structure is illustrated in Figure 2-
2. The structure is based on a single point foundation, stabilized by four guy wires placed
diagonally to the route of the line. The tangent structures will be approximately 38 m in height.
Taller structures with larger footprints will be used where warranted by land use or conditions.
The conceptual design for a typical lattice angle anchor structure is illustrated in Figure 2-3. The
structure has four legs requiring individual foundations and a footprint of approximately 13.7 m2
square. The typical structure height is approximately 30 m. The average span between
structures will be approximately 470 m, resulting in approximately 2.1 structures per kilometre.
Additional detail respecting span length and tower placement is provided in Section 2.3.4.2.
2.3.2.2 Conductors and Insulators
The structures for the Generation Outlet Transmission Lines will carry a three-phase 138 kV ac
circuit consisting of three Aluminum Conductor Steel Reinforced phase conductors.
The specified phase conductor is a single aluminum conductor steel reinforced conductor,
39.3 mm (1.55 in.) in diameter. The conductors will be insulated from the structures by insulator
35 65 65 35
200
Figure 2-4: Typical Cross Section of Generation Outlet Transmission Line Right-of-Way
KEEYASK TRANSMISSION PROJECT EA REPORT
CHAPTER 2 – PROJECT DESCRIPTION
2-6
strings consisting of ceramic insulator bells attached to the cross arms of the structures using
insulator string assemblies. Conductor clearances are discussed in Section 2.3.4.3.
2.3.2.3 Overhead Ground Wires
One galvanized steel strand ground conductor having an overall diameter of 9 mm
(approximately 0.34 in.) will be strung between the peaks of the structures to provide lightning
protection. In addition, an optical ground wire (OPGW) will be strung between and attached to
the peaks of the towers in place of one of the ground wires on KR1. The optical ground wire will
serve both to provide grounding and lightning protection, and to transmit communications for
line control and protection.
2.3.2.4 Switchyard Terminations
Terminating the Generation Outlet Transmission Lines will require the retrofit of one existing bay
for KR1 and the addition of one bay for KR2 and KR3 at the Radisson Converter Station. The
related installations are similar and incremental to the existing development and operation of
these facilities.
2.3.3 Construction Power Transmission Line
Construction power will be supplied by a 21-km, 138 kV Construction Power Transmission Line
which will tap the Kelsey to Radisson (KN36) 138 kv transmission line between Ilford Station
and the tap to Gillam Station. The tap point along KN36 is approximately 33 km from Ilford
Station and 29 km from the Gillam Station tap. The width of the right-of-way will be 60 m for
most of its length (Figure 2-5), except for the locations where the line will share a right-of-way
with GOT lines, as described in Section 2.3.4.1.
2.3.3.1 Structure Design and Location
Guyed tubular suspension structures will be used for straight (tangent) sections (as illustrated in
Figure 2-6). Tubular angle anchor structures will be used for angle or dead-end towers
(Figure 2-7).
The average span between structures will be approximately 350 m, resulting in approximately
2.9 structures per kilometre. Additional detail respecting span length and tower placement is
provided in Section 2.3.4.2.
2.3.3.2 Conductors and Insulators
The structures will carry a three-phase 138 kV ac circuit consisting of three aluminum conductor
steel reinforced phase conductors, each 18.3 mm in diameter.
58 m (190’) CLEARING WIDTH
60 m (197) RIGHT-OF-WAY WIDTH
Figure 2-5: Typical Cross Section of Construction Power Transmission Line Right-of-Way
TYPICAL RIGHT OF WAY
138 KV CONSTRUCTION POWER TRANSMISSION LINE
60 m
TYPICAL GUYED TUBULAR SUSPENSION STRUCTURE
Figure 2-6: Typical Guyed Tubular Suspension Structure
Figure 2-7: Typical Tubular Angle Anchor Structure
KEEYASK TRANSMISSION PROJECT EA REPORT
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2-7
Conductors will be insulated from the structures by an insulator string consisting of eight
ceramic insulator bells.
2.3.3.3 Overhead Ground Wires
Two galvanized steel strand ground conductors having an overall diameter of 9 mm
(approximately 0.34 in.) will be strung between the two peaks of the structures to provide
lightning protection.
2.3.4 General Transmission Line Design Considerations
2.3.4.1 Rights-of-way and Structure Configuration
The width of rights-of-way will vary for the transmission line, particularly on those segments
where they share common corridors. Map 2-3 indicates locations where the rights-of-way will
change and Figures 2-8 to 2-11 show the structure locations across the rights-of-way at these
locations.
Detailed engineering design for transmission facilities will be undertaken after receipt of Project
environmental approvals, and following right-of-way acquisition and detailed field survey.
Precise tower locations and required conductor-to-ground clearances will be established at that
time.
2.3.4.2 Tower Spacing and Span Length
Special crossing structures will be necessary in specific circumstances (e.g., long-span
crossings of Nelson River, road crossings, or crossings of other transmission lines). Such
structures will typically require greater height, greater strength and heavier construction, but will
otherwise be similar to other suspension structures on the line. Final structure locations will be
determined on the basis of field surveys, and will reflect detailed engineering and economic
analysis with respect to span length, local soil conditions, topographic and geological features,
and proximity to existing infrastructure. Subject to detailed engineering analysis, tower location
(tower “spotting”) has been identified as a potential mitigation measure to reduce adverse
environmental and aesthetic effects. Location preferences identified in the course of the SSEA
process (including more detailed pre-construction evaluation of the selected rights-of-way) will
be included in the engineering analysis and, where technically and economically feasible,
incorporated in the final structure placement decision during the pre-construction phase of the
Project.
Figure 2-8: Rights-of-Way for Sections B-B and C-C
Figure 2-9: Rights-of-Way for Sections D-D and E-E
Figure 2-10: Rights-of-Way for Sections F-F and G-G
Figure 2-11: Rights-of-Way for Section H-H
KEEYASK TRANSMISSION PROJECT EA REPORT
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2-8
2.3.4.3 Conductor Clearance
All new 138 kV transmission lines including Unit, Generation Outlet and Construction Power will
be designed to the following minimum conductor-to-ground clearances shown in Table 2-1,
which will meet or exceed C22.3 No. 1” Overhead Systems” values.
Table 2-1: Minimum Conductor to Ground Clearances
Condition 138 kV ac Line
Farmland 7.3 m / 24 ft. (CSA 5.5 m / 18 ft.)
Roads, Highways and Street
Crossings10.7 m / 35 ft. (CSA 5.5 m / 18 ft.)
Railway Crossings 10.7 m / 35 ft. (CSA 8.4 m / 28 ft.)
Underground Pipeline Crossings 7.3 m / 24 ft. (CSA 5.5 m / 18 ft.)
Nelson River Clearance 17.3 m / 57 ft.
2.3.5 Construction Power Station
A new 138 kV to 12.47 kV permanent wood-pole/steel Construction Power Station, located on
the north side of the Nelson River, will be needed for construction power. The Construction
Power Station will be built on a 2.25-ha site that will be developed to accommodate three
transformer banks T1-3 and will supply the necessary power (22 MVA) for the construction of
the Keeyask Generating Station (Figure 2-12).
2.3.5.1 138 kv Structures and Equipment
The 138 kV structures will be composed of steel. The Construction Power Transmission Line
will terminate at transformers T1 and T2 and the backup Construction Power Transmission Line
(KR1) from Radisson Converter station will be terminate at transformer T3.
2.3.5.2 12 kV Structures and Equipment
The 12 kV wood pole structures will be developed to distribute power to the construction site
and will have five feeders and four 2,400 KVAR capacitor banks. The Construction Power
Station will have capacity to expand to three more feeders if required during construction. The
line egress for the five feeders will be built underground.
Figure 2-12: Schematic of Construction Power Station Concept
TemporaryConstructionPower Line
ConstructionPower Transmission
Line (KN36) Tap
Control
Building
Communication
Tower
150 M
150 M
96 M
65 M
138 kV STRUCTURES & EQUIPMENT
12 kV STRUCTURES & EQUIPMENT
KEEYASK TRANSMISSION PROJECT EA REPORT
CHAPTER 2 – PROJECT DESCRIPTION
2-9
2.3.5.3 Site Security
The Construction Power Station site will be enclosed within a single continuous perimeter fence,
consisting of heavy chain link fabric extending to an approximate height of 2.1 m, with a top
guard of at least three strands of barbed wire extending to an overall height of approximately
2.4 m.
2.3.5.4 Station Grounding System
The Construction Power Station site will include a subsurface ground grid for personnel and
equipment safety, conforming to Manitoba Hydro best practices for station design.
The station ground grid will be placed under the insulating stone surface and will extend just
beyond the perimeter fence in accordance with the applicable standards. The subsurface
ground grid at the site will consist of numerous copper clad steel ground rods (approximately
three metres in length) driven into the ground and connected together below the surface with
bare copper wire. The ground grid will also connect to metallic objects within the station site
such as the perimeter fence, steel structures, equipment structures and foundations,
transformers, buildings, pipes, cables, etc.
2.3.5.5 Communications Facilities
The Construction Power Station will require communications to extend local voice and data
services. These communication pathways will generally be comprised of fibre optic networks.
An underground cable installed along the station access road from PR 280 will extend optical
communications from the existing Manitoba Hydro optical cable running parallel to PR 280 at
the junction with the North Access Road. The station will also require a communications tower
and antenna to provide for local wireless voice and data communications.
2.3.5.6 138 kV ac Disconnect Switches
High-voltage circuit disconnect switches are required to carry load current, to switch equipment
and lines in and out of service as operating conditions dictate, and to isolate faulty equipment
connected to, or within, the switchyard.
2.3.5.7 Service Transformers
Service transformers will be required to serve the auxiliary power requirements of the station
including the ac switchyard, control building and equipment. Auxiliary power requirements
include electrical loads such as building heating and cooling, process cooling systems, lighting,
and various other support systems needed for station operation. Two single-phase, two-winding,
12.47 kV service transformers will be required, each will be an insulating oil type.
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2.3.5.8 Control Buildings
One building will be required to house the control, protection, and communications equipment
necessary for Construction Power Station operation. Cables will connect the control buildings to
the ac apparatus. The control buildings typically contain battery banks to meet the power
requirements for the electrical equipment installed within the building. Approximately 1,300 litres
of lead-acid battery acid will be contained within the batteries in the control building. A separate
battery storage room within the control building will be designed in accordance with Institute of
Electrical and Electronic Engineers (IEEE) Standards Std 484-2002, IEEE Recommended
Practice for Installation Design and Installation of Vented Lead-Acid Batteries for Stationary
Applications, Item 4.2 (a), 2003. The control buildings will also be equipped with heating and air
handling equipment to control the building ambient temperature.
2.3.5.9 Oil Containment
The final design of the station will incorporate an oil containment system based on the results of
an assessment done in accordance with Manitoba Hydro’s Transformer Oil Assessment Manual
(1993). No polychlorinated biphenyl (PCB)-containing equipment or oil will be used.
2.3.5.10 Decommissioning
This station will be required to provide a backup source of power to the Keeyask Generating
Station black start/emergency system and local distribution power. Once Keeyask Generating
Station construction is complete, the T3 transformer will be salvaged as well as the 12 kV bus B,
bus tie switches and feeder 4.
2.3.6 Keeyask Switching Station
A new Keeyask Switching Station is proposed to be located on the south side of the Nelson
River. Power from the proposed Keeyask Generating Station will be delivered to the switching
station by the four (KE1-4) 138 kV Unit Transmission Lines (Figure 2-13).
The 138 kV switching station development will provide the terminal and related facilities needed
to establish the connection between the four 138 kV Unit Transmission Lines and the three
138 kV GOT lines to Radisson Converter Station.
2.3.6.1 138 kV ac switchyard and Intermediate Bus Structure
Components within the 138 kV ac switchyard will include all the necessary concrete
foundations, steel structures, equipment supports and station service transformers. Equipment
foundations will range from concrete slab-on-grade to deep-piled foundations, depending on
equipment weight and geotechnical conditions. Steel structures will be placed on the
foundations and will support electrical apparatus, electrical conductors, and hardware
ControlBuilding
138kV
IntermediateBus
Structure
138kV acSwitchyard
Ac TransmissionLines
Ac Unit Lines
from G.S.
Future
StationExpansion
Developed Station
Site Area 35 Ha
Generation Outlet
Transmission Lines
Figure 2-13: Schematic of Keeyask Switching Station Concept
KEEYASK TRANSMISSION PROJECT EA REPORT
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2-11
associated with the switchyard and transformer functions. Service transformers and other
equipment structures will also be placed on concrete foundations. The switchyard will be air-
insulated. Detailed numbers and ratings of the switchyard electrical apparatus to be located
within the ac switchyard will not be known until final design is complete.
2.3.6.2 Site Security
The Keeyask Switching Station site will be enclosed within a single continuous perimeter fence,
consisting of heavy chain link fabric extending to an approximate height of 2.1 m, with a top
guard of at least three strands of barbed wire extending to an overall height of approximately
2.4 m. A security building will be located at the primary access gate for security personnel, and
will house closed circuit television monitoring equipment, computer equipment, and other
systems needed to support site security operations. The security building will be constructed
above grade and will include electric heating and air conditioning systems.
2.3.6.3 Station Grounding System
The Keeyask Switching Station site will include a subsurface ground grid for personnel and
equipment safety, conforming to Manitoba Hydro best practices for station design.
The station ground grid will be placed under the insulating stone surface and will extend just
beyond the perimeter fence in accordance with the standard. The subsurface ground grid at the
site will consist of numerous copper clad steel ground rods (approximately 3 m in length) driven
into the ground and connected together below the surface with bare copper wire. The ground
grid will also connect to metallic objects within the station site such as the perimeter fence, steel
structures, equipment structures and foundations, transformers, buildings, pipes and cables,
etc.
2.3.6.4 Communications Facilities
The Keeyask Switching Station will require multiple communications paths to facilitate reliable
integration into the existing Manitoba Hydro power system. These communication pathways will
generally be comprised of fibre optic networks. A combination of optical ground wire and
underground optical cabling will provide communication pathways for ac system control and
operation.
2.3.6.5 138 kV ac Circuit Breakers and Disconnect Switches
High-voltage circuit breakers are required to carry load current, to switch equipment and lines in
and out of service as operating conditions dictate, and to isolate faulty equipment connected to,
or within, the switchyard. Modern high voltage ac circuit breakers contain a sealed mixture of
sulphur hexafluoride (SF6) and carbon tetraflouride (CF4) or nitrogen (N2) gases as the
insulating medium inside the breaker.
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Seven three-phase 138 kV circuit breakers will be required for the ac switchyard. Each breaker
will contain approximately 75 kg of insulating gas, comprised of approximately 50% SF6 and
50% CF4 or N2.
2.3.6.6 Station Service Lines and Transformers
Two overhead station service lines from the Keeyask Generating Station at 12.47 kV will supply
operational power to the switching station service transformers. These transformers are
required to serve the auxiliary power requirements of the switching station including the ac
switchyard, control building and equipment. Auxiliary power requirements include electrical
loads such as building heating and cooling, process cooling systems, lighting, and various other
support systems needed for station operation. Two three-phase, 12.47 kV station service
transformers will be required, each be a dry type with no insulating oil.
2.3.6.7 Control Buildings
One building will be required to house the control, protection, and communications equipment
necessary for its operation. Cables will connect the control buildings to the ac switchyard
apparatus. The control buildings typically contain battery banks to meet the power requirements
for the electrical equipment installed within the building. Approximately 1,300 litres of (lead-acid)
battery acid will be contained within the batteries in each control building containment systems.
The control buildings will also require heating and air handling equipment to control the building
ambient temperature.
2.3.6.8 Oil Containment
No oil containment is required for the Keeyask Switching Station as no insulating oils are used
in site equipment.
2.3.7 Existing Radisson Converter Station Upgrade
The existing Radisson Converter Station will undergo upgrades to prepare it for Keeyask
Generating Station output. The modifications at the Radisson Converter Station are contained
within the existing station fence line and will utilize existing foundation and oil containment
infrastructure (Figure 2-14).
The existing Radisson Converter Station will be upgraded in two stages, as follows:
Stage I: Addition of a 138 kV breaker to accommodate the initial new 138 kV transmission line
KR1 from Keeyask Switching Station.
Stage II: Station equipment will include the addition of a 138 kV bay (Bay 1) complete with four
138 kV breakers and associated equipment for the termination of two additional lines (KR2 and
Figure 2-14: Existing Radisson Converter Station: Proposed Work Areas
KEEYASK TRANSMISSION PROJECT EA REPORT
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KR3) from the Keeyask Switching Station. KR2 and KR3 will enter the west side of the station
utilizing dead-ended steel structure with line switches. KR2 and KR3 lines will proceed to
underground around the station and finally terminate to Bay 1. This is done to avoid complex
line crossings into the station. Thirty–one 138 kV ac breakers will also need to be replaced due
to fault levels exceeding existing breaker ratings.
2.3.7.1 138 kV ac Switchyard
Components within the 138 kV ac switchyard will include all the necessary concrete
foundations, steel structures and equipment supports, and station service transformers.
Equipment foundations will range from concrete slab-on-grade to deep-piled foundations,
depending on equipment weight and geotechnical conditions. Steel structures will be placed on
the foundations and will support electrical apparatus and electrical conductors, and hardware
associated with the switchyard and transformer functions. Detailed numbers and ratings of the
switchyard electrical apparatus to be located within the ac switchyard will not be known until
final design is complete.
2.3.7.2 138 kV ac Circuit Breakers and Disconnect Switches
The design and structure of circuit breakers and disconnect switches for the Radisson
Converter Station is comparable to those intended for the Keeyask Switching Station. Thirty-six
three-phase 138 kV circuit breakers will be required for the Radisson ac switchyard. Each
breaker will contain approximately 75 kg of insulating gas, comprised of approximately 50% SF6
and 50% CF4 or N2.
2.3.7.3 Station Grounding
The current Radisson Converter Station includes installation of a station ground grid throughout
most of the larger station area. The grid comprises numerous copper clad steel ground rods
(approximately three metres in length) driven into the ground, connected together below the
insulating stone surface with bare copper wire, and also connected to metallic objects such as
steel structures, equipment structures and foundations, transformers, buildings, pipes, cables,
etc.
The Keeyask Transmission Project will require extension of the ground grid to the 138 kV ac
switchyard areas. The ground grid is required for personnel and equipment safety, and will
conform to Manitoba Hydro best practices for station design. The extension will be integrated
with and, where necessary, will supplement the existing ground grid network.
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2.3.7.4 Communications Facilities
The Radisson Converter Station has existing communication infrastructure at the site. This
infrastructure facilitates reliable integration of the Radisson Converter Station into the existing
Manitoba Hydro Communication System, and is generally comprised of fibre optic networks.
Optical ground wire, as described in Section 2.3.6.4, will provide the primary communication
pathway to Keeyask Switching Station for control and operation of the Generation Outlet
Transmission system.
2.3.7.5 Oil Containment
The current Radisson Converter Station includes all principal components of the station oil
containment system. These include a combination of point-source containment and non-point-
source containment for oil-filled equipment, all in conformance with applicable oil containment
standards.
Additional primary containment will be required for large Keeyask Transmission Project
equipment located within the expanded 138 kV ac switchyard. Primary containment at the
equipment location will be provided for equipment containing greater than 5,000 litres of oil. This
containment will utilize a concrete, clay or synthetic membrane barrier, extending a minimum of
1.5 m beyond the edge of any the equipment. The majority of the primary containment facilities
will be connected to the oil-water separator building using fast drain piping.
The extended oil containment facilities will also collect rain, snow melt and water for the fire
suppression systems. Water collected in the oil containment system from these sources will
undergo oil/water separation in the separator building.
2.4 LAND REQUIREMENTS FOR PROJECT
Manitoba Hydro determines the widths of its rights-of-way to allow for safe conductor “swing
out” (i.e., to provide sufficient lateral distance to any object located at the edge of the rights-of-
way to avoid flashover under windy conditions), to provide sufficient distance between the line
and the rights-of-way edge (and between adjacent lines), to avoid damage in the event of a
structure failure, to limit radio interference (based on Canadian Standards Association [CSA]
standards respecting radio interference), and, in the case of remote rights-of-way, to facilitate
helicopter access for line maintenance or repair.
The proposed 138 kV transmission lines and stations will traverse provincial Crown land. As
Crown land is involved, Manitoba Hydro will secure the necessary station and transmission line
rights-of-way through Crown Land Reservations and easement agreements with the Province of
Manitoba.
KEEYASK TRANSMISSION PROJECT EA REPORT
CHAPTER 2 – PROJECT DESCRIPTION
2-15
2.4.1 Transmission Lines
The width of the right-of-way for the Construction Power line will be 60 m. A 265-m width will be
required for the four Unit Transmission Lines between the Keeyask Generating Station and the
Keeyask Switching Station. A 200-m width will be required for the three Generation Outlet
Transmission lines proposed between the Keeyask Switching Station and Radisson Converter
Station. The estimated total cleared area required for all Project transmission lines rights-of-way
is approximately 744 ha.
2.4.2 Stations
The proposed Keeyask Switching Station will require 13 ha of land for Project development and
an adjacent 22 ha of land will be acquired for possible future expansion, for a total site area of
35 ha. The Construction Power Station will require 2.25 ha of land. No additional land is
required for the Radisson Station upgrade.
2.5 CONSTRUCTION ACTIVITIES
2.5.1 Overall Schedule
The overall construction schedule is shown on Figure 2-15.
2.5.1.1 Construction Power
The Construction Power Transmission Line and Construction Power Station are proposed to be
in service by May 2015. The property acquisition is scheduled to be completed by February
2014, with construction of the Construction Power Station beginning in April 2014, and the
Construction Transmission Line beginning October 2014. No construction will begin until all
regulatory approvals and property reservations are completed. The earliest clearing and
construction would start is November 2013; the exact start date is subject to regulatory approval
of the Keeyask Generation Project. The Keeyask Construction Power 138 kV Transmission Line
and Station is proposed to be in service by July 2015.
The initial 138 kV Generation Outlet Transmission line (KR1), designed for backup construction
power supply from Radisson to the Construction Power Station, is scheduled to be completed
by May 2015. It is expected due to time and weather constraints that only the right-of-way for
KR1 will be cleared at this time and KR2 and KR3 will be cleared prior to 2017 when
construction is expected to begin.